hubctl stack init <statefile> command does not recover certain env parameters from state

[oginskis]

Steps to reproduce:

1. Create a stack template with one or few parameters defined with a component discriminator, for example:

- name: ingress
  component: mlflow
  parameters:
  - name: hosts
    fromEnv: MY_COOL_ENV_VAR

2. Init, configure, and deploy the stack.
3. Verify that MY_COOL_ENV_VAR value is present in the .env file
4. Re-initialize the stack from state: hubctl stack init <statefile ref>
5. MY_COOL_ENV_VAR is not present in the .env file and a user is asked to enter it again on hubctl stack configure

Expected:
MY_COOL_ENV_VAR should be present in the .env file.